mcs/mcs/dynamic.cs

   1 //
   2 // dynamic.cs: support for dynamic expressions
   3 //
   4 // Authors: Marek Safar (marek.safar@gmail.com)
   5 //
   6 // Dual licensed under the terms of the MIT X11 or GNU GPL
   7 //
   8 // Copyright 2009 Novell, Inc
   9 // Copyright 2011 Xamarin Inc.
  10 //
  11
  12 using System;
  13 using System.Linq;
  14 using SLE = System.Linq.Expressions;
  15
  16 #if NET_4_0
  17 using System.Dynamic;
  18 #endif
  19
  20 namespace Mono.CSharp
  21 {
  22         //
  23         // A copy of Microsoft.CSharp/Microsoft.CSharp.RuntimeBinder/CSharpBinderFlags.cs
  24         // has to be kept in sync
  25         //
  26         [Flags]
  27         public enum CSharpBinderFlags
  28         {
  29                 None = 0,
  30                 CheckedContext = 1,
  31                 InvokeSimpleName = 1 << 1,
  32                 InvokeSpecialName = 1 << 2,
  33                 BinaryOperationLogical = 1 << 3,
  34                 ConvertExplicit = 1 << 4,
  35                 ConvertArrayIndex = 1 << 5,
  36                 ResultIndexed = 1 << 6,
  37                 ValueFromCompoundAssignment = 1 << 7,
  38                 ResultDiscarded = 1 << 8
  39         }
  40
  41         //
  42         // Type expression with internal dynamic type symbol
  43         //
  44         class DynamicTypeExpr : TypeExpr
  45         {
  46                 public DynamicTypeExpr (Location loc)
  47                 {
  48                         this.loc = loc;
  49                 }
  50
  51                 public override TypeSpec ResolveAsType (IMemberContext ec)
  52                 {
  53                         eclass = ExprClass.Type;
  54                         type = ec.Module.Compiler.BuiltinTypes.Dynamic;
  55                         return type;
  56                 }
  57         }
  58
  59         #region Dynamic runtime binder expressions
  60
  61         //
  62         // Expression created from runtime dynamic object value by dynamic binder
  63         //
  64         public class RuntimeValueExpression : Expression, IDynamicAssign, IMemoryLocation
  65         {
  66 #if !NET_4_0
  67                 public class DynamicMetaObject
  68                 {
  69                         public TypeSpec RuntimeType;
  70                         public TypeSpec LimitType;
  71                         public SLE.Expression Expression;
  72                 }
  73 #endif
  74
  75                 readonly DynamicMetaObject obj;
  76
  77                 public RuntimeValueExpression (DynamicMetaObject obj, TypeSpec type)
  78                 {
  79                         this.obj = obj;
  80                         this.type = type;
  81                         this.eclass = ExprClass.Variable;
  82                 }
  83
  84                 #region Properties
  85
  86                 public bool IsSuggestionOnly { get; set; }
  87
  88                 public DynamicMetaObject MetaObject {
  89                         get { return obj; }
  90                 }
  91
  92                 #endregion
  93
  94                 public void AddressOf (EmitContext ec, AddressOp mode)
  95                 {
  96                         throw new NotImplementedException ();
  97                 }
  98
  99                 public override bool ContainsEmitWithAwait ()
 100                 {
 101                         throw new NotSupportedException ();
 102                 }
 103
 104                 public override Expression CreateExpressionTree (ResolveContext ec)
 105                 {
 106                         throw new NotSupportedException ();
 107                 }
 108
 109                 protected override Expression DoResolve (ResolveContext ec)
 110                 {
 111                         return this;
 112                 }
 113
 114                 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
 115                 {
 116                         return this;
 117                 }
 118
 119                 public override void Emit (EmitContext ec)
 120                 {
 121                         throw new NotImplementedException ();
 122                 }
 123
 124                 #region IAssignMethod Members
 125
 126                 public void Emit (EmitContext ec, bool leave_copy)
 127                 {
 128                         throw new NotImplementedException ();
 129                 }
 130
 131                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
 132                 {
 133                         throw new NotImplementedException ();
 134                 }
 135
 136                 #endregion
 137
 138                 public SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source)
 139                 {
 140                         return obj.Expression;
 141                 }
 142
 143                 public override SLE.Expression MakeExpression (BuilderContext ctx)
 144                 {
 145 #if STATIC
 146                         return base.MakeExpression (ctx);
 147 #else
 148
 149         #if NET_4_0
 150                                 if (type.IsStruct && !obj.Expression.Type.IsValueType)
 151                                         return SLE.Expression.Unbox (obj.Expression, type.GetMetaInfo ());
 152
 153                                 if (obj.Expression.NodeType == SLE.ExpressionType.Parameter) {
 154                                         if (((SLE.ParameterExpression) obj.Expression).IsByRef)
 155                                                 return obj.Expression;
 156                                 }
 157         #endif
 158
 159                                 return SLE.Expression.Convert (obj.Expression, type.GetMetaInfo ());
 160 #endif
 161                 }
 162         }
 163
 164         //
 165         // Wraps runtime dynamic expression into expected type. Needed
 166         // to satify expected type check by dynamic binder and no conversion
 167         // is required (ResultDiscarded).
 168         //
 169         public class DynamicResultCast : ShimExpression
 170         {
 171                 public DynamicResultCast (TypeSpec type, Expression expr)
 172                         : base (expr)
 173                 {
 174                         this.type = type;
 175                 }
 176
 177                 protected override Expression DoResolve (ResolveContext ec)
 178                 {
 179                         expr = expr.Resolve (ec);
 180                         eclass = ExprClass.Value;
 181                         return this;
 182                 }
 183
 184 #if NET_4_0
 185                 public override SLE.Expression MakeExpression (BuilderContext ctx)
 186                 {
 187 #if STATIC
 188                         return base.MakeExpression (ctx);
 189 #else
 190                         return SLE.Expression.Block (expr.MakeExpression (ctx), SLE.Expression.Default (type.GetMetaInfo ()));
 191 #endif
 192                 }
 193 #endif
 194         }
 195
 196         #endregion
 197
 198         //
 199         // Creates dynamic binder expression
 200         //
 201         interface IDynamicBinder
 202         {
 203                 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
 204         }
 205
 206         //
 207         // Extends standard assignment interface for expressions
 208         // supported by dynamic resolver
 209         //
 210         interface IDynamicAssign : IAssignMethod
 211         {
 212                 SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source);
 213         }
 214
 215         //
 216         // Base dynamic expression statement creator
 217         //
 218         class DynamicExpressionStatement : ExpressionStatement
 219         {
 220                 //
 221                 // Binder flag dynamic constant, the value is combination of
 222                 // flags known at resolve stage and flags known only at emit
 223                 // stage
 224                 //
 225                 protected class BinderFlags : EnumConstant
 226                 {
 227                         DynamicExpressionStatement statement;
 228                         CSharpBinderFlags flags;
 229
 230                         public BinderFlags (CSharpBinderFlags flags, DynamicExpressionStatement statement)
 231                                 : base (statement.loc)
 232                         {
 233                                 this.flags = flags;
 234                                 this.statement = statement;
 235                                 eclass = 0;
 236                         }
 237
 238                         protected override Expression DoResolve (ResolveContext ec)
 239                         {
 240                                 Child = new IntConstant (ec.BuiltinTypes, (int) (flags | statement.flags), statement.loc);
 241
 242                                 type = ec.Module.PredefinedTypes.BinderFlags.Resolve ();
 243                                 eclass = Child.eclass;
 244                                 return this;
 245                         }
 246                 }
 247
 248                 readonly Arguments arguments;
 249                 protected IDynamicBinder binder;
 250                 protected Expression binder_expr;
 251
 252                 // Used by BinderFlags
 253                 protected CSharpBinderFlags flags;
 254
 255                 TypeSpec binder_type;
 256                 TypeParameters context_mvars;
 257
 258                 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
 259                 {
 260                         this.binder = binder;
 261                         this.arguments = args;
 262                         this.loc = loc;
 263                 }
 264
 265                 public Arguments Arguments {
 266                         get {
 267                                 return arguments;
 268                         }
 269                 }
 270
 271                 public override bool ContainsEmitWithAwait ()
 272                 {
 273                         return arguments.ContainsEmitWithAwait ();
 274                 }
 275
 276                 public override Expression CreateExpressionTree (ResolveContext ec)
 277                 {
 278                         ec.Report.Error (1963, loc, "An expression tree cannot contain a dynamic operation");
 279                         return null;
 280                 }
 281
 282                 protected override Expression DoResolve (ResolveContext rc)
 283                 {
 284                         if (DoResolveCore (rc))
 285                                 binder_expr = binder.CreateCallSiteBinder (rc, arguments);
 286
 287                         return this;
 288                 }
 289
 290                 protected bool DoResolveCore (ResolveContext rc)
 291                 {
 292                         if (rc.CurrentTypeParameters != null && rc.CurrentTypeParameters[0].IsMethodTypeParameter)
 293                                 context_mvars = rc.CurrentTypeParameters;
 294
 295                         int errors = rc.Report.Errors;
 296                         var pt = rc.Module.PredefinedTypes;
 297
 298                         binder_type = pt.Binder.Resolve ();
 299                         pt.CallSite.Resolve ();
 300                         pt.CallSiteGeneric.Resolve ();
 301
 302                         eclass = ExprClass.Value;
 303
 304                         if (type == null)
 305                                 type = rc.BuiltinTypes.Dynamic;
 306
 307                         if (rc.Report.Errors == errors)
 308                                 return true;
 309
 310                         rc.Report.Error (1969, loc,
 311                                 "Dynamic operation cannot be compiled without `Microsoft.CSharp.dll' assembly reference");
 312                         return false;
 313                 }
 314
 315                 public override void Emit (EmitContext ec)
 316                 {
 317                         EmitCall (ec, binder_expr, arguments,  false);
 318                 }
 319
 320                 public override void EmitStatement (EmitContext ec)
 321                 {
 322                         EmitCall (ec, binder_expr, arguments, true);
 323                 }
 324
 325                 protected void EmitCall (EmitContext ec, Expression binder, Arguments arguments, bool isStatement)
 326                 {
 327                         //
 328                         // This method generates all internal infrastructure for a dynamic call. The
 329                         // reason why it's quite complicated is the mixture of dynamic and anonymous
 330                         // methods. Dynamic itself requires a temporary class (ContainerX) and anonymous
 331                         // methods can generate temporary storey as well (AnonStorey). Handling MVAR
 332                         // type parameters rewrite is non-trivial in such case as there are various
 333                         // combinations possible therefore the mutator is not straightforward. Secondly
 334                         // we need to keep both MVAR(possibly VAR for anon storey) and type VAR to emit
 335                         // correct Site field type and its access from EmitContext.
 336                         //
 337
 338                         int dyn_args_count = arguments == null ? 0 : arguments.Count;
 339                         int default_args = isStatement ? 1 : 2;
 340                         var module = ec.Module;
 341
 342                         bool has_ref_out_argument = false;
 343                         var targs = new TypeExpression[dyn_args_count + default_args];
 344                         targs[0] = new TypeExpression (module.PredefinedTypes.CallSite.TypeSpec, loc);
 345
 346                         TypeExpression[] targs_for_instance = null;
 347                         TypeParameterMutator mutator;
 348
 349                         var site_container = ec.CreateDynamicSite ();
 350
 351                         if (context_mvars != null) {
 352                                 TypeParameters tparam;
 353                                 TypeContainer sc = site_container;
 354                                 do {
 355                                         tparam = sc.CurrentTypeParameters;
 356                                         sc = sc.Parent;
 357                                 } while (tparam == null);
 358
 359                                 mutator = new TypeParameterMutator (context_mvars, tparam);
 360
 361                                 if (!ec.IsAnonymousStoreyMutateRequired) {
 362                                         targs_for_instance = new TypeExpression[targs.Length];
 363                                         targs_for_instance[0] = targs[0];
 364                                 }
 365                         } else {
 366                                 mutator = null;
 367                         }
 368
 369                         for (int i = 0; i < dyn_args_count; ++i) {
 370                                 Argument a = arguments[i];
 371                                 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
 372                                         has_ref_out_argument = true;
 373
 374                                 var t = a.Type;
 375
 376                                 // Convert any internal type like dynamic or null to object
 377                                 if (t.Kind == MemberKind.InternalCompilerType)
 378                                         t = ec.BuiltinTypes.Object;
 379
 380                                 if (targs_for_instance != null)
 381                                         targs_for_instance[i + 1] = new TypeExpression (t, loc);
 382
 383                                 if (mutator != null)
 384                                         t = t.Mutate (mutator);
 385
 386                                 targs[i + 1] = new TypeExpression (t, loc);
 387                         }
 388
 389                         TypeExpr del_type = null;
 390                         TypeExpr del_type_instance_access = null;
 391                         if (!has_ref_out_argument) {
 392                                 string d_name = isStatement ? "Action" : "Func";
 393
 394                                 TypeExpr te = null;
 395                                 Namespace type_ns = module.GlobalRootNamespace.GetNamespace ("System", true);
 396                                 if (type_ns != null) {
 397                                         te = type_ns.LookupType (module, d_name, dyn_args_count + default_args, LookupMode.Normal, loc);
 398                                 }
 399
 400                                 if (te != null) {
 401                                         if (!isStatement) {
 402                                                 var t = type;
 403                                                 if (t.Kind == MemberKind.InternalCompilerType)
 404                                                         t = ec.BuiltinTypes.Object;
 405
 406                                                 if (targs_for_instance != null)
 407                                                         targs_for_instance[targs_for_instance.Length - 1] = new TypeExpression (t, loc);
 408
 409                                                 if (mutator != null)
 410                                                         t = t.Mutate (mutator);
 411
 412                                                 targs[targs.Length - 1] = new TypeExpression (t, loc);
 413                                         }
 414
 415                                         del_type = new GenericTypeExpr (te.Type, new TypeArguments (targs), loc);
 416                                         if (targs_for_instance != null)
 417                                                 del_type_instance_access = new GenericTypeExpr (te.Type, new TypeArguments (targs_for_instance), loc);
 418                                         else
 419                                                 del_type_instance_access = del_type;
 420                                 }
 421                         }
 422
 423                         //
 424                         // Create custom delegate when no appropriate predefined delegate has been found
 425                         //
 426                         Delegate d;
 427                         if (del_type == null) {
 428                                 TypeSpec rt = isStatement ? ec.BuiltinTypes.Void : type;
 429                                 Parameter[] p = new Parameter[dyn_args_count + 1];
 430                                 p[0] = new Parameter (targs[0], "p0", Parameter.Modifier.NONE, null, loc);
 431
 432                                 var site = ec.CreateDynamicSite ();
 433                                 int index = site.Containers == null ? 0 : site.Containers.Count;
 434
 435                                 if (mutator != null)
 436                                         rt = mutator.Mutate (rt);
 437
 438                                 for (int i = 1; i < dyn_args_count + 1; ++i) {
 439                                         p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
 440                                 }
 441
 442                                 d = new Delegate (site, new TypeExpression (rt, loc),
 443                                         Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
 444                                         new MemberName ("Container" + index.ToString ("X")),
 445                                         new ParametersCompiled (p), null);
 446
 447                                 d.CreateContainer ();
 448                                 d.DefineContainer ();
 449                                 d.Define ();
 450
 451                                 site.AddTypeContainer (d);
 452                                 del_type = new TypeExpression (d.CurrentType, loc);
 453                                 if (targs_for_instance != null) {
 454                                         del_type_instance_access = null;
 455                                 } else {
 456                                         del_type_instance_access = del_type;
 457                                 }
 458                         } else {
 459                                 d = null;
 460                         }
 461
 462                         var site_type_decl = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec, new TypeArguments (del_type), loc);
 463                         var field = site_container.CreateCallSiteField (site_type_decl, loc);
 464                         if (field == null)
 465                                 return;
 466
 467                         if (del_type_instance_access == null) {
 468                                 var dt = d.CurrentType.DeclaringType.MakeGenericType (module, context_mvars.Types);
 469                                 del_type_instance_access = new TypeExpression (MemberCache.GetMember (dt, d.CurrentType), loc);
 470                         }
 471
 472                         var instanceAccessExprType = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec,
 473                                 new TypeArguments (del_type_instance_access), loc);
 474
 475                         if (instanceAccessExprType.ResolveAsType (ec.MemberContext) == null)
 476                                 return;
 477
 478                         bool inflate_using_mvar = context_mvars != null && ec.IsAnonymousStoreyMutateRequired;
 479
 480                         TypeSpec gt;
 481                         if (inflate_using_mvar || context_mvars == null) {
 482                                 gt = site_container.CurrentType;
 483                         } else {
 484                                 gt = site_container.CurrentType.MakeGenericType (module, context_mvars.Types);
 485                         }
 486
 487                         // When site container already exists the inflated version has to be
 488                         // updated manually to contain newly created field
 489                         if (gt is InflatedTypeSpec && site_container.AnonymousMethodsCounter > 1) {
 490                                 var tparams = gt.MemberDefinition.TypeParametersCount > 0 ? gt.MemberDefinition.TypeParameters : TypeParameterSpec.EmptyTypes;
 491                                 var inflator = new TypeParameterInflator (module, gt, tparams, gt.TypeArguments);
 492                                 gt.MemberCache.AddMember (field.InflateMember (inflator));
 493                         }
 494
 495                         FieldExpr site_field_expr = new FieldExpr (MemberCache.GetMember (gt, field), loc);
 496
 497                         BlockContext bc = new BlockContext (ec.MemberContext, null, ec.BuiltinTypes.Void);
 498                         SymbolWriter.OpenCompilerGeneratedBlock (ec);
 499
 500                         Arguments args = new Arguments (1);
 501                         args.Add (new Argument (binder));
 502                         StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (instanceAccessExprType, "Create"), args)));
 503
 504                         if (s.Resolve (bc)) {
 505                                 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc), loc), s, loc);
 506                                 init.Emit (ec);
 507                         }
 508
 509                         args = new Arguments (1 + dyn_args_count);
 510                         args.Add (new Argument (site_field_expr));
 511                         if (arguments != null) {
 512                                 int arg_pos = 1;
 513                                 foreach (Argument a in arguments) {
 514                                         if (a is NamedArgument) {
 515                                                 // Name is not valid in this context
 516                                                 args.Add (new Argument (a.Expr, a.ArgType));
 517                                         } else {
 518                                                 args.Add (a);
 519                                         }
 520
 521                                         if (inflate_using_mvar && a.Type != targs[arg_pos].Type)
 522                                                 a.Expr.Type = targs[arg_pos].Type;
 523
 524                                         ++arg_pos;
 525                                 }
 526                         }
 527
 528                         Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (bc), args, loc).Resolve (bc);
 529                         if (target != null)
 530                                 target.Emit (ec);
 531
 532                         SymbolWriter.CloseCompilerGeneratedBlock (ec);
 533                 }
 534
 535                 public static MemberAccess GetBinderNamespace (Location loc)
 536                 {
 537                         return new MemberAccess (new MemberAccess (
 538                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
 539                 }
 540
 541                 protected MemberAccess GetBinder (string name, Location loc)
 542                 {
 543                         return new MemberAccess (new TypeExpression (binder_type, loc), name, loc);
 544                 }
 545         }
 546
 547         //
 548         // Dynamic member access compound assignment for events
 549         //
 550         class DynamicEventCompoundAssign : ExpressionStatement
 551         {
 552                 class IsEvent : DynamicExpressionStatement, IDynamicBinder
 553                 {
 554                         string name;
 555
 556                         public IsEvent (string name, Arguments args, Location loc)
 557                                 : base (null, args, loc)
 558                         {
 559                                 this.name = name;
 560                                 binder = this;
 561                         }
 562
 563                         public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 564                         {
 565                                 type = ec.BuiltinTypes.Bool;
 566
 567                                 Arguments binder_args = new Arguments (3);
 568
 569                                 binder_args.Add (new Argument (new BinderFlags (0, this)));
 570                                 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
 571                                 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 572
 573                                 return new Invocation (GetBinder ("IsEvent", loc), binder_args);
 574                         }
 575                 }
 576
 577                 Expression condition;
 578                 ExpressionStatement invoke, assign;
 579
 580                 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
 581                 {
 582                         condition = new IsEvent (name, args, loc);
 583                         this.invoke = invoke;
 584                         this.assign = assignment;
 585                         this.loc = loc;
 586                 }
 587
 588                 public override Expression CreateExpressionTree (ResolveContext ec)
 589                 {
 590                         return condition.CreateExpressionTree (ec);
 591                 }
 592
 593                 protected override Expression DoResolve (ResolveContext rc)
 594                 {
 595                         type = rc.BuiltinTypes.Dynamic;
 596                         eclass = ExprClass.Value;
 597                         condition = condition.Resolve (rc);
 598                         return this;
 599                 }
 600
 601                 public override void Emit (EmitContext ec)
 602                 {
 603                         var rc = new ResolveContext (ec.MemberContext);
 604                         var expr = new Conditional (new BooleanExpression (condition), invoke, assign, loc).Resolve (rc);
 605                         expr.Emit (ec);
 606                 }
 607
 608                 public override void EmitStatement (EmitContext ec)
 609                 {
 610                         var stmt = new If (condition, new StatementExpression (invoke), new StatementExpression (assign), loc);
 611                         stmt.Emit (ec);
 612                 }
 613         }
 614
 615         class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
 616         {
 617                 public DynamicConversion (TypeSpec targetType, CSharpBinderFlags flags, Arguments args, Location loc)
 618                         : base (null, args, loc)
 619                 {
 620                         type = targetType;
 621                         base.flags = flags;
 622                         base.binder = this;
 623                 }
 624
 625                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 626                 {
 627                         Arguments binder_args = new Arguments (3);
 628
 629                         flags |= ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
 630
 631                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 632                         binder_args.Add (new Argument (new TypeOf (type, loc)));
 633                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 634                         return new Invocation (GetBinder ("Convert", loc), binder_args);
 635                 }
 636         }
 637
 638         class DynamicConstructorBinder : DynamicExpressionStatement, IDynamicBinder
 639         {
 640                 public DynamicConstructorBinder (TypeSpec type, Arguments args, Location loc)
 641                         : base (null, args, loc)
 642                 {
 643                         this.type = type;
 644                         base.binder = this;
 645                 }
 646
 647                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 648                 {
 649                         Arguments binder_args = new Arguments (3);
 650
 651                         binder_args.Add (new Argument (new BinderFlags (0, this)));
 652                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 653                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 654
 655                         return new Invocation (GetBinder ("InvokeConstructor", loc), binder_args);
 656                 }
 657         }
 658
 659         class DynamicIndexBinder : DynamicMemberAssignable
 660         {
 661                 bool can_be_mutator;
 662
 663                 public DynamicIndexBinder (Arguments args, Location loc)
 664                         : base (args, loc)
 665                 {
 666                 }
 667
 668                 public DynamicIndexBinder (CSharpBinderFlags flags, Arguments args, Location loc)
 669                         : this (args, loc)
 670                 {
 671                         base.flags = flags;
 672                 }
 673
 674                 protected override Expression DoResolve (ResolveContext ec)
 675                 {
 676                         can_be_mutator = true;
 677                         return base.DoResolve (ec);
 678                 }
 679
 680                 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
 681                 {
 682                         Arguments binder_args = new Arguments (3);
 683
 684                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 685                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 686                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 687
 688                         isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
 689                         return new Invocation (GetBinder (isSet ? "SetIndex" : "GetIndex", loc), binder_args);
 690                 }
 691
 692                 protected override Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
 693                 {
 694                         //
 695                         // Indexer has arguments which complicates things as the setter and getter
 696                         // are called in two steps when unary mutator is used. We have to make a
 697                         // copy of all variable arguments to not duplicate any side effect.
 698                         //
 699                         // ++d[++arg, Foo ()]
 700                         //
 701
 702                         if (!can_be_mutator)
 703                                 return base.CreateSetterArguments (rc, rhs);
 704
 705                         var setter_args = new Arguments (Arguments.Count + 1);
 706                         for (int i = 0; i < Arguments.Count; ++i) {
 707                                 var expr = Arguments[i].Expr;
 708
 709                                 if (expr is Constant || expr is VariableReference || expr is This) {
 710                                         setter_args.Add (Arguments [i]);
 711                                         continue;
 712                                 }
 713
 714                                 LocalVariable temp = LocalVariable.CreateCompilerGenerated (expr.Type, rc.CurrentBlock, loc);
 715                                 expr = new SimpleAssign (temp.CreateReferenceExpression (rc, expr.Location), expr).Resolve (rc);
 716                                 Arguments[i].Expr = temp.CreateReferenceExpression (rc, expr.Location).Resolve (rc);
 717                                 setter_args.Add (Arguments [i].Clone (expr));
 718                         }
 719
 720                         setter_args.Add (new Argument (rhs));
 721                         return setter_args;
 722                 }
 723         }
 724
 725         class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
 726         {
 727                 readonly ATypeNameExpression member;
 728
 729                 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
 730                         : base (null, args, loc)
 731                 {
 732                         base.binder = this;
 733                         this.member = member;
 734                 }
 735
 736                 //
 737                 // When a return type is known not to be dynamic
 738                 //
 739                 public DynamicInvocation (ATypeNameExpression member, Arguments args, TypeSpec type, Location loc)
 740                         : this (member, args, loc)
 741                 {
 742                         this.type = type;
 743                 }
 744
 745                 public static DynamicInvocation CreateSpecialNameInvoke (ATypeNameExpression member, Arguments args, Location loc)
 746                 {
 747                         return new DynamicInvocation (member, args, loc) {
 748                                 flags = CSharpBinderFlags.InvokeSpecialName
 749                         };
 750                 }
 751
 752                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 753                 {
 754                         Arguments binder_args = new Arguments (member != null ? 5 : 3);
 755                         bool is_member_access = member is MemberAccess;
 756
 757                         CSharpBinderFlags call_flags;
 758                         if (!is_member_access && member is SimpleName) {
 759                                 call_flags = CSharpBinderFlags.InvokeSimpleName;
 760                                 is_member_access = true;
 761                         } else {
 762                                 call_flags = 0;
 763                         }
 764
 765                         binder_args.Add (new Argument (new BinderFlags (call_flags, this)));
 766
 767                         if (is_member_access)
 768                                 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, member.Name, member.Location)));
 769
 770                         if (member != null && member.HasTypeArguments) {
 771                                 TypeArguments ta = member.TypeArguments;
 772                                 if (ta.Resolve (ec)) {
 773                                         var targs = new ArrayInitializer (ta.Count, loc);
 774                                         foreach (TypeSpec t in ta.Arguments)
 775                                                 targs.Add (new TypeOf (t, loc));
 776
 777                                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (targs, loc)));
 778                                 }
 779                         } else if (is_member_access) {
 780                                 binder_args.Add (new Argument (new NullLiteral (loc)));
 781                         }
 782
 783                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 784
 785                         Expression real_args;
 786                         if (args == null) {
 787                                 // Cannot be null because .NET trips over
 788                                 real_args = new ArrayCreation (
 789                                         new MemberAccess (GetBinderNamespace (loc), "CSharpArgumentInfo", loc),
 790                                         new ArrayInitializer (0, loc), loc);
 791                         } else {
 792                                 real_args = new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc);
 793                         }
 794
 795                         binder_args.Add (new Argument (real_args));
 796
 797                         return new Invocation (GetBinder (is_member_access ? "InvokeMember" : "Invoke", loc), binder_args);
 798                 }
 799
 800                 public override void EmitStatement (EmitContext ec)
 801                 {
 802                         flags |= CSharpBinderFlags.ResultDiscarded;
 803                         base.EmitStatement (ec);
 804                 }
 805         }
 806
 807         class DynamicMemberBinder : DynamicMemberAssignable
 808         {
 809                 readonly string name;
 810
 811                 public DynamicMemberBinder (string name, Arguments args, Location loc)
 812                         : base (args, loc)
 813                 {
 814                         this.name = name;
 815                 }
 816
 817                 public DynamicMemberBinder (string name, CSharpBinderFlags flags, Arguments args, Location loc)
 818                         : this (name, args, loc)
 819                 {
 820                         base.flags = flags;
 821                 }
 822
 823                 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
 824                 {
 825                         Arguments binder_args = new Arguments (4);
 826
 827                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 828                         binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
 829                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 830                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 831
 832                         isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
 833                         return new Invocation (GetBinder (isSet ? "SetMember" : "GetMember", loc), binder_args);
 834                 }
 835         }
 836
 837         //
 838         // Any member binder which can be source and target of assignment
 839         //
 840         abstract class DynamicMemberAssignable : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
 841         {
 842                 Expression setter;
 843                 Arguments setter_args;
 844
 845                 protected DynamicMemberAssignable (Arguments args, Location loc)
 846                         : base (null, args, loc)
 847                 {
 848                         base.binder = this;
 849                 }
 850
 851                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 852                 {
 853                         //
 854                         // DoResolve always uses getter
 855                         //
 856                         return CreateCallSiteBinder (ec, args, false);
 857                 }
 858
 859                 protected abstract Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet);
 860
 861                 protected virtual Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
 862                 {
 863                         var setter_args = new Arguments (Arguments.Count + 1);
 864                         setter_args.AddRange (Arguments);
 865                         setter_args.Add (new Argument (rhs));
 866                         return setter_args;
 867                 }
 868
 869                 public override Expression DoResolveLValue (ResolveContext rc, Expression right_side)
 870                 {
 871                         if (right_side == EmptyExpression.OutAccess) {
 872                                 right_side.DoResolveLValue (rc, this);
 873                                 return null;
 874                         }
 875
 876                         if (DoResolveCore (rc)) {
 877                                 setter_args = CreateSetterArguments (rc, right_side);
 878                                 setter = CreateCallSiteBinder (rc, setter_args, true);
 879                         }
 880
 881                         eclass = ExprClass.Variable;
 882                         return this;
 883                 }
 884
 885                 public override void Emit (EmitContext ec)
 886                 {
 887                         // It's null for ResolveLValue used without assignment
 888                         if (binder_expr == null)
 889                                 EmitCall (ec, setter, Arguments, false);
 890                         else
 891                                 base.Emit (ec);
 892                 }
 893
 894                 public override void EmitStatement (EmitContext ec)
 895                 {
 896                         // It's null for ResolveLValue used without assignment
 897                         if (binder_expr == null)
 898                                 EmitCall (ec, setter, Arguments, true);
 899                         else
 900                                 base.EmitStatement (ec);
 901                 }
 902
 903                 #region IAssignMethod Members
 904
 905                 public void Emit (EmitContext ec, bool leave_copy)
 906                 {
 907                         throw new NotImplementedException ();
 908                 }
 909
 910                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
 911                 {
 912                         EmitCall (ec, setter, setter_args, !leave_copy);
 913                 }
 914
 915                 #endregion
 916         }
 917
 918         class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
 919         {
 920                 readonly string name;
 921
 922                 public DynamicUnaryConversion (string name, Arguments args, Location loc)
 923                         : base (null, args, loc)
 924                 {
 925                         this.name = name;
 926                         base.binder = this;
 927                 }
 928
 929                 public static DynamicUnaryConversion CreateIsTrue (ResolveContext rc, Arguments args, Location loc)
 930                 {
 931                         return new DynamicUnaryConversion ("IsTrue", args, loc) { type = rc.BuiltinTypes.Bool };
 932                 }
 933
 934                 public static DynamicUnaryConversion CreateIsFalse (ResolveContext rc, Arguments args, Location loc)
 935                 {
 936                         return new DynamicUnaryConversion ("IsFalse", args, loc) { type = rc.BuiltinTypes.Bool };
 937                 }
 938
 939                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 940                 {
 941                         Arguments binder_args = new Arguments (4);
 942
 943                         MemberAccess sle = new MemberAccess (new MemberAccess (
 944                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
 945
 946                         var flags = ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
 947
 948                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 949                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
 950                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 951                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 952
 953                         return new Invocation (GetBinder ("UnaryOperation", loc), binder_args);
 954                 }
 955         }
 956
 957         sealed class DynamicSiteClass : HoistedStoreyClass
 958         {
 959                 public DynamicSiteClass (TypeDefinition parent, MemberBase host, TypeParameters tparams)
 960                         : base (parent, MakeMemberName (host, "DynamicSite", parent.DynamicSitesCounter, tparams, Location.Null), tparams, Modifiers.STATIC)
 961                 {
 962                         parent.DynamicSitesCounter++;
 963                 }
 964
 965                 public FieldSpec CreateCallSiteField (FullNamedExpression type, Location loc)
 966                 {
 967                         int index = AnonymousMethodsCounter++;
 968                         Field f = new HoistedField (this, type, Modifiers.PUBLIC | Modifiers.STATIC, "Site" + index.ToString ("X"), null, loc);
 969                         f.Define ();
 970
 971                         AddField (f);
 972                         return f.Spec;
 973                 }
 974         }
 975 }